WO2004025876A1 - 無線通信装置、受信装置、および受信方式選択方法 - Google Patents
無線通信装置、受信装置、および受信方式選択方法 Download PDFInfo
- Publication number
- WO2004025876A1 WO2004025876A1 PCT/JP2003/008881 JP0308881W WO2004025876A1 WO 2004025876 A1 WO2004025876 A1 WO 2004025876A1 JP 0308881 W JP0308881 W JP 0308881W WO 2004025876 A1 WO2004025876 A1 WO 2004025876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reception
- signal
- linear equalization
- section
- mobile station
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7105—Joint detection techniques, e.g. linear detectors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
- H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/03433—Arrangements for removing intersymbol interference characterised by equaliser structure
- H04L2025/03535—Variable structures
- H04L2025/03547—Switching between time domain structures
Definitions
- the present invention relates to a wireless communication device, a receiving device, and a receiving method selection method.
- MCS Modulation Coding Schemes
- the mobile station device When the adaptive modulation scheme based on the MCS selection is applied to transmission data from the base station device, first, the mobile station device receives a known signal transmitted by the base station device. Then, the mobile station device measures the reception quality such as SIR (Signal to Interference Ratio) using the received known signal, and indicates the state of the propagation environment based on the reception quality. The base station device is notified of CQI (Channel Quality Indicator). Then, the base station apparatus selects an MCS corresponding to the CQI with reference to a table provided in advance, performs coding and modulation specified by the selected MCS on transmission data, and transmits the data to the mobile station apparatus. Send.
- SIR Signal to Interference Ratio
- the base station device transmits data at a high transmission rate to mobile station devices having a good propagation environment, and transmits data at a low transmission rate to mobile station devices having a bad propagation environment. Can suppress errors and improve the overall system throughput.
- the present inventors have found that, when the mobile station apparatus is moving at a relatively low speed, the effect of multipath can be reduced by using a linear equalizer, while the mobile station apparatus moves at a high speed. In this case, we focused on the fact that better reception characteristics can be obtained by performing RAKE reception compared to the linear equalizer when the interference power from other cells is large. In addition, by using linear equalization and RAKE reception in accordance with changes in the propagation environment, the effects of multipath can be sufficiently reduced, and high transmission rate MC
- a radio communication apparatus includes: an estimating unit configured to estimate a signal propagation environment; and at least two reception schemes including at least ⁇ -shaped equalization. And selecting means for selecting the receiving method.
- a receiving device includes: an obtaining unit configured to obtain, from at least two reception schemes including at least linear equalization, information on a reception scheme selected according to a propagation environment; Receiving means for receiving a signal in a receiving method designated by the receiving method information.
- a method for selecting a reception scheme includes a step of estimating a propagation environment of a signal, and at least two reception schemes including linear equalization, in accordance with the estimated propagation environment. Selecting a signal reception method.
- FIG. 1 is a block diagram illustrating a configuration of a mobile station device according to Embodiment 1 of the present invention
- FIG. 2 is a flowchart illustrating a reception scheme selection operation of the mobile station device according to Embodiment 1
- FIG. 4 is a block diagram illustrating a configuration of a mobile station apparatus according to Embodiment 2 of the present invention
- FIG. 4 is a flowchart illustrating a CQI determination operation of the mobile station apparatus according to Embodiment 2
- FIG. 6 is a diagram for explaining the operation of the mobile station device
- FIG. 6 is a block diagram illustrating a configuration of a base station device according to Embodiment 3 of the present invention
- FIG. 7 is a block diagram of the mobile station device according to Embodiment 3. Block diagram showing the configuration,
- FIG. 8 is a flowchart illustrating a receiving scheme selection operation of the base station apparatus according to Embodiment 3
- FIG. 9 is a flowchart illustrating an MCS selection operation of the base station apparatus according to Embodiment 3
- FIG. 11 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 4 of the present invention
- FIG. 11 is a block diagram illustrating a configuration of a mobile station apparatus according to Embodiment 4
- FIG. 13 is a block diagram illustrating a configuration of a base station apparatus according to Embodiment 5 of the present invention
- FIG. 14 is a block diagram illustrating a configuration of a mobile station apparatus according to Embodiment 6 of the present invention
- FIG. 15 is a flowchart showing a reception scheme selection operation of the mobile station apparatus according to Embodiment 6.
- FIG. 16 is a block diagram showing a configuration of a mobile station apparatus according to Embodiment 7 of the present invention.
- FIG. 17 is a flowchart showing a reception scheme selection operation of the mobile station apparatus according to Embodiment 7.
- FIG. 1 is a block diagram showing a configuration of a mobile station device according to Embodiment 1 of the present invention.
- the mobile station apparatus shown in FIG. 1 includes a radio transmission / reception unit 102, a known signal acquisition unit 104, an SIR measurement unit 106, a Doppler frequency detection unit 108, an interference power measurement unit 110, and a reception method selection. It has a unit 112, a shakuhachi 1 ⁇ receiving unit 114, a linear equalizing unit 116, a demodulating unit 118, a decoding unit 120, and a CQI determining unit 122.
- the wireless transmission and reception unit 102 transmits and receives signals via an antenna, and performs predetermined wireless processing (down conversion, A / D conversion, DZA conversion, up conversion, and the like).
- the known signal acquisition unit 104 acquires a known signal from the signal received by the wireless transmission and reception unit 102.
- the SIR measuring section 106 measures the SIR of the known signal.
- the SIR indicates the ratio between the signal power and the interference power, and the CQI to be reported to the communication partner base station apparatus is determined according to the SIR, and the base station apparatus calculates ⁇ ⁇ 31 to 1 Select ⁇ ⁇ 3.
- the Doppler frequency detector 108 detects the Doppler frequency from the received signal and measures the Doppler shift amount.
- the Doppler shift amount is an index of the moving speed of the mobile station device.
- Interference power measurement section 110 measures interference power from another cell. It should be noted that the known signal acquisition unit 104, the SIR measurement unit 106, the Doppler frequency detection unit 108, and the interference power measurement unit 110 perform transmission in the present embodiment. It constitutes a transport environment estimation unit.
- Receiving method selecting section 112 selects either RAKE receiving or linear equalizing receiving method based on SIR, Doppler shift amount, and interference power. The selection of the reception method by the reception method selection unit 112 will be described later in detail.
- RAKE receiving section 114 receives the received signal by RAKE when RAKE receiving is selected by receiving scheme selecting section 112.
- the linear equalizer 116 linearly equalizes the received signal when linear equalization is selected by the receiving method selector 112.
- the linear equalizer provided in the linear equalizer 116 has a certain limit in the integration period for despreading and integrating a known signal. Is known to deteriorate.
- Demodulation section 118 demodulates the signal after linear equalization.
- Decoding section 120 decodes the signal after RAKE reception or the signal after demodulation to obtain decoded data.
- CQI determining section 122 determines a CQI corresponding to the SIR measured by SIR measuring section 106 and causes radio transmitting / receiving section 102 to transmit the CQI.
- the Doppler shift amount measured by Doppler frequency detection section 108 is compared with a predetermined threshold value A (ST1000).
- the interference power from another cell measured by the interference power measuring unit 110 is compared with the predetermined threshold B1 (ST 1100). As a result of this comparison, if the interference power is equal to or smaller than the predetermined threshold B1, linear equalization is selected as the reception method (ST 1500). Also, the interference power Is larger than a predetermined threshold B1, the SIR measured by the SIR measuring unit 106 is compared with a predetermined threshold C1 (ST 1200). Linear equalization is selected (ST 1500).
- the repetition interference power is compared with predetermined threshold B2 (ST 1300).
- the predetermined threshold B2 compared with the interference power in ST 1300 is a value larger than the predetermined threshold B1 in ST 1100. If the result of this comparison indicates that the interference power is greater than the predetermined threshold B2, RAKE reception is selected as the reception method (ST 1600).
- predetermined threshold value C2 compared with S I in ST 1400 is a value larger than predetermined threshold value C 1 in ST 1200.
- RAKE reception is selected as the reception method (ST 1600).
- SIR is equal to or more than the predetermined threshold C2
- linear equalization is selected as the reception method. (ST 1500).
- RAKE reception is selected as the reception method.
- RAKE reception is selected as the reception method.
- the Doppler shift amount is small, in other words, when the moving speed of the mobile station device is low and the influence of interference is small, linear equalization is selected as the receiving method.
- linear equalization is performed as the reception method. Therefore, when data is transmitted at MCS with a high transmission rate, even if the desired error rate cannot be achieved with RAKE reception, the effects of multipath can be reduced by linear equalization to achieve the desired Achieve the error rate And the overall system throughput can be improved.
- two thresholds are set for the interference power and the SIR, respectively, when selecting the receiving method.
- the present invention is not limited to this. Is also good.
- a feature of the second embodiment of the present invention is that the mobile station device selects a receiving method according to the propagation environment and, at the same time, transmits a CQI to the base station device so that an MCS having a high transmission rate is selected. It is.
- FIG. 3 is a block diagram showing a configuration of the mobile station apparatus according to the present embodiment.
- the same parts as those of the mobile station apparatus shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the mobile station apparatus shown in FIG. 3 includes a radio transmission / reception section 102, a known signal acquisition section 104, an SIR measurement section 106, a Doppler frequency detection section 108, an interference power measurement section 110, a reception scheme selection section 112, and a reception section. 114, a linear equalizer 116, a demodulator 118, a decoder 120, and a CQI determiner 122a.
- the CQI determination unit 122a determines the CQI corresponding to the SIR measured by the SIR measurement unit 106, and newly determines the CQI when linear equalization is selected as the reception method.
- the wireless transmitting / receiving section 102 transmits a CQI such that a higher transmission rate MCS is selected from the two CQIs.
- CQI determination operation is performed in CQI determination section 122a. It is also assumed that the CQI determination unit 122a has been informed of which of the RAKE reception and the linear equalization reception system has been selected by the reception system selection unit 112. Here, the operation of selecting a receiving method by receiving method selecting section 112 is the same as in the first embodiment, and a description thereof will be omitted.
- CQ I R when the RAKE reception is selected is determined as (ST2000).
- CQ I R for example, as shown in FIG. 5, the transmission bit length, number of multiplex codes, and modulation schemes (i.e., MCS) is a value defining a This value is reported to the base station apparatus location Thereby, the base station apparatus selects the above MCS and transmits data.
- MCS modulation schemes
- CQ I EQ on the assumption that linear equalization is performed is newly determined, CQ I EQ and CQ I R is compared (ST22 00). The result of this comparison, if the CQ I EQ is CQ I R above, CQ I EQ is transmitted from the wireless transmitting and receiving unit 102 (ST 2300), CQ I EQ is CQ I R less than der lever, CQ I R is It is transmitted from wireless transmitting / receiving section 102 (ST 2400).
- the base station apparatus reports a CQI to select a higher transmission rate MCS to the base station apparatus.
- the station device can transmit data at a high transmission rate, thereby improving the overall system throughput.
- a feature of Embodiment 3 of the present invention is that the base station apparatus selects a receiving method according to the propagation environment and notifies the mobile station apparatus.
- FIG. 6 is a block diagram showing a configuration of the base station apparatus according to the present embodiment.
- the base station apparatus shown in FIG. 6 includes a radio transmission / reception section 202, a Doppler frequency detection section 204, a CQI extraction section 206, a reception scheme selection section 208, a notification signal generation section 210, and an MCS selection section. 2 12, an adaptive coding section 2 14, an adaptive modulation section 2 16, and a multiplexing section 2 18.
- the wireless transmission / reception unit 202 transmits / receives a signal via an antenna and performs predetermined wireless processing (down conversion, A / D conversion, DZA conversion, up conversion, and the like).
- the Doppler frequency detector 204 detects a Doppler frequency from the received signal and measures a Doppler shift amount.
- the Doppler shift amount is an index of the moving speed of the mobile station device.
- Doppler frequency detecting section 2 44 constitutes a propagation environment estimating section in the present embodiment.
- CQI extraction section 206 extracts CQI included in the received signal.
- the reception method selection unit 208 selects either the Rake reception or the linear equalization reception method based on the Doppler shift amount as the reception method of the mobile station apparatus as the communication partner station.
- Notification signal generating section 210 generates a notification signal for notifying the selected reception method.
- the selection unit 2 12 selects the MCS corresponding to the CQI, and notifies the information of the selected MCS to the adaptive coding unit 2 14 and the adaptive modulation unit 2 16.
- Adaptive coding section 214 codes transmission data at a coding rate specified by the selected MCS.
- Adaptive modulation section 211 modulates transmission data according to a modulation scheme defined by the selected MCS.
- the multiplexing unit 218 multiplexes the transmission data and the notification signal, and transmits the multiplexed data via the wireless transmission / reception unit 202.
- FIG. 7 is a block diagram showing a configuration of the mobile station apparatus according to the present embodiment.
- the same parts as those of the mobile station apparatus shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the mobile station apparatus shown in FIG. 7 includes a radio transmission / reception unit 102, a known signal acquisition unit 104, an SIR measurement unit 106, a rake reception unit 114, a linear equalization unit 116, and a demodulation unit. 1 1 8, It has a decoding section 120, a CQI determination section 122, a notification signal acquisition section 142, and a reception scheme switching section 144.
- Notification signal obtaining section 142 obtains a notification signal included in the received signal.
- Receiving method switching section 144 switches the receiving method to RAKE reception or linear equalization according to the notification signal.
- the mobile station apparatus determines SIR SIR force measured by the measurement unit 106, et al., The CQ I R in the case of selecting the RAKE receiver receiving scheme at CQ I determination unit 122, including the CQ I R
- the signal is transmitted via the wireless transmission / reception unit 102.
- the transmitted signal is received by the wireless transmission / reception unit 202 of the base station device, and predetermined # processing is performed.
- the Doppler frequency detector 204 detects the Doppler frequency from the received signal, and measures the Doppler shift amount.
- the receiving system selecting unit 208 selects a receiving system according to the flow shown in FIG. That is, the Doppler shift amount is compared with a predetermined threshold value A (ST 3000), and if the Doppler shift amount is equal to or smaller than the predetermined threshold value A, linear equalization is selected as a reception method in the mobile station apparatus (ST 3100). Conversely, if the Doppler shift amount is larger than the predetermined threshold A, it is determined that the linear equalizer cannot follow the mobile station because the moving speed of the mobile station is high, and RAKE reception is performed as a receiving method in the mobile station. Is selected (ST 3200).
- the selected reception scheme is notified to notification signal generation section 210 and MCS selection section 212, and notification signal generation section 210 generates a notification signal for notifying the mobile station apparatus of the selected reception scheme.
- MCS is selected according to the flow shown in FIG. That is, first, RAKE reception is used as a reception method in the mobile station apparatus. Or CQ I R when it is selected is determined to a value that is extracted by CQ I extractor 206 (ST4000), Contact Keru reception scheme to the mobile station apparatus notified from the receiving scheme selector 208 is linear equalization It is determined whether or not it is (ST4100). When the linear equalization is not selected, MC S corresponding to CQ I R is selected (ST4400).
- the transmission data is encoded and modulated by adaptive coding section 214 and adaptive modulation section 216 at a coding rate and a modulation scheme specified by the selected MCS, respectively. Further, the transmission data and the notification signal generated by notification signal generation section 210 are multiplexed by multiplexing section 218 and transmitted via wireless transmission / reception section 202.
- the signal transmitted from the base station device is received by radio transmitting / receiving section 102 of the mobile station device, and predetermined radio processing is performed.
- the known signal is obtained by a known signal acquiring unit 104, the measured SIR by SIR measurement tough 106 again, CQ I R is determined by CQ I determiner 1 22.
- notification signal acquisition section 142 acquires a notification signal included in the received signal, and acquires information on a reception scheme to be selected in the mobile station apparatus. This information is output to the reception scheme switching section 144, and the reception scheme switching section 144 controls one of the rake reception section 114 and the linear equalization section 116 to operate.
- the linear equalization unit 116 operates correctly. Then, the received data is subjected to linear equalization, demodulated by the demodulation section 118, and decoded data is obtained by the decoding section 120.
- a reception scheme in the mobile station apparatus is selected, the selected reception scheme is notified to the mobile station apparatus, and linear equalization is performed as the reception scheme. If selected, the MCS is selected on the assumption that linear equalization is performed in the mobile station device, and data is transmitted.Therefore, the base station device performs data transmission at a higher transmission rate. Meanwhile, the mobile station apparatus can perform demodulation and decoding correctly by performing linear equalization on the received data, and can improve the throughput of the entire system.
- Embodiment 4 of the present invention is that the base station apparatus can reduce the integration period of a known signal for performing linear equalization by the mobile station apparatus, that is, the coefficient update cycle in the linear equalizer.
- linear equalization can be selected as a receiving method even when the mobile station apparatus detects the moving speed is high.
- FIG. 10 is a block diagram showing a configuration of the base station apparatus according to the present embodiment.
- the same parts as those of the base station apparatus shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
- the base station apparatus shown in FIG. 10 includes a radio transmission / reception unit 202, a CQI extraction unit 206, an MCS selection unit 212a, an adaptive encoding unit 214, an adaptive modulation unit 216, and a multiplexing unit 2. 18 a, and a shortest cycle detecting section 242.
- the MCS selection unit 211a selects the MCS corresponding to the CQI extracted by the CQI extraction unit 206.
- the multiplexing unit 218a multiplexes the transmission data and the information of the shortest cycle detected by the shortest cycle detecting unit 242 described later, and transmits the multiplexed data via the wireless transmitting / receiving unit 202.
- the shortest-period detection unit 2 4 2 uses the coefficient in the linear equalizer provided in the mobile station device. The shortest period that can be updated is detected.
- the integration period is shortened (for example, if one symbol of the known signal is composed of 256 chips, it corresponds to 128 chips.
- the linear equalization can be performed normally even if it is shortened to 12 symbol periods or the 1Z4 symbolonole period corresponding to 64 chips).
- the cycle when this integration cycle is shortened to the maximum is called the shortest cycle.
- FIG. 11 is a block diagram showing a configuration of the mobile station apparatus according to the present embodiment.
- the same parts as those of the mobile station apparatus shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the mobile station apparatus shown in FIG. 11 includes a radio transmission / reception section 102, a known signal acquisition section 104, an SIR measurement section 106, a Doppler frequency detection section 108, an interference power measurement section 110, a reception scheme selection section 1 1 2a, 1 1 ⁇ It includes a receiving unit 114, a linear equalizing unit 116, a demodulating unit 118, a decoding unit 120, a CQI determining unit 122, and a shortest period obtaining unit 162.
- the reception scheme selection unit 112a selects either the RAKE reception or the linear equalization reception scheme based on the SIR, the Doppler shift amount, the interference power, and the shortest period. The selection of the reception method by the reception method selection unit 112a will be described later in detail.
- the shortest cycle acquisition unit 162 acquires the shortest cycle information included in the received signal, and notifies the reception method selection unit 112a.
- known signal acquiring section 104, SIR measuring section 106, Doppler frequency detecting section 108, interference power measuring section 110, and shortest cycle acquiring section 162 constitute a propagation environment estimating section in the present embodiment.
- the mobile station apparatus determines the CQI from the SIR measured by the SIR measurement section 106 in the CQI determination section 122, and transmits a signal including this CQI to the radio transmission / reception section. Transmit via 102.
- the transmitted signal is received by the wireless transmission / reception unit 202 of the base station device, and predetermined wireless processing is performed.
- the CQI included in the received signal is extracted by the CQI extraction section 206, and the MCS corresponding to the CQI is selected by the MCS selection section 212a.
- the transmission data is encoded and modulated by adaptive coding section 214 and adaptive modulating section 216 at a coding rate and a modulation scheme defined by the selected MSS, respectively.
- the shortest period of the provided linear equalizer is detected.
- the detected shortest cycle is multiplexed with the transmission data by the multiplexing unit 2118a, and transmitted via the wireless transmission / reception unit 202.
- the signal transmitted from the base station device is received by the wireless transmission / reception unit 102 of the mobile station device, and predetermined radio processing is performed.
- the known signal is acquired by the known signal acquisition unit 104, the SIR is measured again by the SIR measurement unit 106, the CQI is determined by the CQI determination unit 122, and the SIR and Doppler shift are determined. The amount and the interference power are notified to the reception method selection unit 1 1 2a.
- the shortest cycle information included in the received signal is acquired by the shortest cycle acquisition section 162, and the shortest cycle is notified to the reception scheme selection section 112a.
- a threshold value A for determining the Doppler shift amount, is selected based on the shortest period (ST500).
- This threshold value A ' indicates the fastest moving speed that the linear equalizer can follow when the integration period of the linear equalizer provided in the linear equalizer 1 16 is set to be equal to or longer than the shortest period. The value is equal to the Doppler shift amount.
- the amount is compared with the threshold value A '(ST5100).
- the mobile station apparatus determines that the linear equalizer provided in linear equalizer 116 is moving at a speed that cannot be followed. Then, RAKE reception is selected as the reception method (ST5700).
- the interference power from another cell measured by interference power measurement section 110 is compared with predetermined threshold value B1 (ST 5200). As a result of this comparison, if the interference power is equal to or smaller than predetermined threshold B1, linear equalization is selected as the reception method (ST 5600). If the interference power is larger than the predetermined threshold B1, the SIR measured by the SIR measuring section 106 is compared with the predetermined threshold C1 (ST5300). If the SIR is equal to or larger than the predetermined threshold C1, the reception is performed. Linear equalization is selected as the method (ST 5600).
- predetermined threshold value B2 compared with interference power in ST 5400 is a value larger than predetermined threshold value B1 in ST 5200. If the result of this comparison indicates that the interference power is greater than the predetermined threshold B2, RAKE reception is selected as the reception method (ST5700).
- predetermined threshold value C2 compared with SI in ST 5500 is a value larger than predetermined threshold value C1 in ST 5300.
- RAKE reception is selected as the reception method (ST 5700).
- SIR is equal to or more than the predetermined threshold C2
- linear equalization is selected as the reception method. (ST5600).
- linear equalization will be selected as the receiving method.
- the linear equalizer can follow and the linear equalization is selected as the receiving method, and the throughput of the entire system can be improved.
- two thresholds are set for each of the interference power and the SIR when selecting the reception method.However, the present invention is not limited to this. May be.
- a feature of the fifth embodiment of the present invention is that the base station apparatus can reduce the integration period of a known signal for the mobile station apparatus to perform linear equalization, that is, the coefficient update cycle in the linear equalizer. The point is that the mobile station apparatus selects the receiving method after detecting and determining the optimum updating cycle.
- FIG. 13 is a block diagram showing the configuration of the base station apparatus according to the present embodiment. Note that, in the base station apparatus shown in the figure, the same parts as those of the base station apparatus shown in FIGS. 6 and 10 are denoted by the same reference numerals, and description thereof will be omitted. It is assumed that the base station apparatus shown in the figure communicates with the mobile station apparatus shown in FIG. 7 (Embodiment 3). The base station apparatus shown in FIG.
- the reception scheme selection unit 208a selects one of the reception schemes of RAKE reception or linear equalization based on the Doppler shift amount and the optimum cycle described later.
- the optimum period determination unit 262 determines an optimum period that is equal to or longer than the shortest period that can be followed by the linear equalizer provided in the mobile station device and that is optimal for performing linear equalization.
- Doppler frequency detection section 204, shortest cycle detection section 242, and optimum cycle determination section 262 constitute a propagation environment estimation section in the present embodiment.
- a threshold value of the Doppler shift amount is determined based on the optimal period. This threshold value is a value equal to the Doppler shift amount indicating the fastest moving speed that the linear equalizer can follow when the integration period of the linear equalizer in the mobile station device is set to the optimum period.
- the Doppler shift amount measured by the Doppler frequency detection unit 204 is compared with this threshold value. If the Doppler shift amount is equal to or less than the threshold value, linear equalization is selected as the reception method in the mobile station apparatus, and If the Doppler shift amount is larger than the threshold value, it is determined that the linear equalizer cannot follow because the moving speed of the mobile station device is high, and RAKE reception is selected as the receiving method in the mobile station device.
- the threshold based on the optimal period and the measured Doppler shift amount are compared, and even if the mobile station device is moving at high speed according to the communication status of the base station device, the reception method is linear or the like. Will be selected.
- the threshold value of the Doppler shift amount according to the communication status is set, the reception method in the mobile station apparatus is selected, and the selected reception method is set in the mobile station apparatus.
- the mobile station apparatus selects an MCS on the assumption that linear equalization is performed, and transmits data. Can transmit data at a higher transmission rate, and the mobile station device can perform demodulation and decoding correctly by performing linear equalization on the received data, and reduce the overall system throughput. Can be improved.
- a feature of the sixth embodiment of the present invention is that a reception method is selected based only on the measurement result of SIR to reduce power consumption.
- FIG. 14 is a block diagram showing a configuration of the mobile station apparatus according to the present embodiment.
- the same parts as those of the mobile station apparatus shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
- the mobile station apparatus shown in FIG. 14 includes a radio transmission / reception section 102, a known signal acquisition section 104, an SIR measurement section 106, a reception scheme selection section 112b, a RAKE reception section 114, a linear equalization section 116, a demodulation section 118, It has a decoding section 120 and a CQI determination section 122.
- the reception scheme selection unit 112b selects either a RAKE reception scheme or a linear equalization reception scheme based only on SIR. Specifically, the reception method selection unit 1 1 2b selects RAKE reception as the reception method when the SIR is less than the predetermined threshold, and conversely, when the SIR is equal to or more than the predetermined threshold. Select linear equalization as the receiving method.
- known signal acquisition section 104 and SIR measurement section 106 constitute a propagation environment estimation section in the present embodiment.
- SIR measured by SIR measurement section 106 is compared with a predetermined threshold value C (ST 6000).
- the mobile station device when the SIR is high, the mobile station device is located near the center of the cell (that is, the base station). Station equipment). Near the center of the cell, the effect of multipath is the main factor that degrades the error rate in mobile station equipment. Multipath effects can be easily removed by linear equalization. Therefore, if the SIR is equal to or higher than the predetermined threshold, select linear equalization as the reception method.
- a circuit for measuring the amount of Doppler shift is selected in order to select a reception method that can obtain better error rate characteristics based on only the measurement results of SIR. This is unnecessary, and power consumption can be greatly reduced.
- a feature of the seventh embodiment of the present invention is that a reception method is selected using information on a modulation method and the number of multiplex codes determined by the MCS.
- FIG. 16 is a block diagram showing a configuration of the mobile station device according to the embodiment.
- the same parts as those of the mobile station apparatus shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
- the mobile station apparatus shown in FIG. 16 includes a radio transmission / reception section 102, a known signal acquisition section 104, an SIR measurement section 106, a reception scheme selection section 112c, a RAKE reception section 114, a linear equalization section 116, a demodulation section 118, and decoding.
- Unit 120 CQI determining unit 122, control information obtaining unit 182, and despreading unit 184.
- Control information acquisition section 182 acquires control information about the MCS selected in the base station apparatus, which is included in the received signal, and notifies reception scheme selection section 112c.
- the base station device changes the MCS based on the CQI (for example, in the example shown in FIG. 5, when the data is transmitted by changing the transmission bit length, the number of multiplexed codes, and the modulation method)
- the base station device transmits control information on the changed MCS together with the transmission data to the mobile station device.
- the mobile station apparatus can know the modulation scheme of the transmission data and can demodulate correctly.
- Despreading section 184 despreads the received data according to the number of multiplexed codes notified by the control information.
- SIR measured by SIR measurement section 106 is compared with a predetermined threshold value C (ST 7000).
- RAKE reception is selected as the reception method (ST7400).
- SIR is equal to or larger than predetermined threshold C
- RAKE reception is selected as the reception method (ST7400).
- the modulation scheme is 16QAM
- the number of multiplexed codes reported by the control information is compared with a predetermined threshold D (ST 7200). If the number of multiplexed codes is equal to or more than the predetermined threshold D, linear equalization is selected. (ST 7300). On the other hand, if the number of multiplexed codes is less than predetermined threshold D, RAKE reception is selected as the reception method (ST 7400). By selecting the receiving method in this manner, linear equalization is selected as the receiving method only when the SIR is large, the modulation method is 16QAM, and the number of multiplexed codes is large.
- the data transmission efficiency of QP SK and BP SK is lower than that of 16 QAM, but the error rate characteristics are better. Also, when the number of multiplexed codes is small, interference between codes is reduced, and the error rate performance is improved. In the present embodiment, when MCS having such a good error rate characteristic is selected, RAKE reception is selected as the reception method. Thus, the linear equalizer may be operated only when the MCS with which the error rate characteristic is inferior is selected, and the power consumption can be further reduced as compared with the sixth embodiment.
- the received signal is despread by despreading section 184 according to the number of multiplexed codes notified by the control information. Be scattered.
- the RAKE receiving unit 114 receives RAKE and the decoding unit.
- the data is decrypted by 120 to obtain decrypted data.
- the receiving system is selected using both the information on the modulation system and the number of multiplexed codes included in the control information.
- the receiving method may be selected using only one of them.
- linear equalization is selected as the reception method in the case of 16 QAM
- RAKE reception is selected as the reception method in the case of QP SK or BP SK.
- the present invention is not limited to this, and if a modulation method having better error rate characteristics is selected, RAKE reception may be selected as the reception method.
- the present invention can be applied to a wireless communication device, a receiving device, and a receiving method selection method.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20030795200 EP1473853A1 (en) | 2002-09-10 | 2003-07-14 | Radio communication device, receiver device, and reception manner selecting method |
US10/507,076 US20050164644A1 (en) | 2002-09-10 | 2003-07-14 | Radio communication device receiver device and reception manner selecting method |
AU2003248061A AU2003248061A1 (en) | 2002-09-10 | 2003-07-14 | Radio communication device, receiver device, and reception manner selecting method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002264098 | 2002-09-10 | ||
JP2002-264098 | 2002-09-10 | ||
JP2003104428A JP2004159284A (ja) | 2002-09-10 | 2003-04-08 | 無線通信装置および受信方式選択方法 |
JP2003-104428 | 2003-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004025876A1 true WO2004025876A1 (ja) | 2004-03-25 |
Family
ID=31996129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008881 WO2004025876A1 (ja) | 2002-09-10 | 2003-07-14 | 無線通信装置、受信装置、および受信方式選択方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050164644A1 (ja) |
EP (1) | EP1473853A1 (ja) |
JP (1) | JP2004159284A (ja) |
CN (1) | CN1640021A (ja) |
AU (1) | AU2003248061A1 (ja) |
WO (1) | WO2004025876A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7796680B2 (en) | 2004-02-12 | 2010-09-14 | Nec Corporation | Mobile communication system and wireless apparatus to be used for the same |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7646802B2 (en) * | 2003-06-02 | 2010-01-12 | Qualcomm Incorporated | Communication receiver with hybrid equalizer |
KR100651556B1 (ko) * | 2004-06-30 | 2006-11-29 | 삼성전자주식회사 | 통신 시스템에서 cinr 추정 장치 및 방법 |
ES2384262T3 (es) * | 2004-11-15 | 2012-07-03 | Koninklijke Philips Electronics N.V. | Método y aparato para detectar el estado de alta movilidad de un terminal móvil y dispositivo relacionado |
WO2006095398A1 (ja) * | 2005-03-07 | 2006-09-14 | Fujitsu Limited | 無線通信システム |
US9184898B2 (en) * | 2005-08-01 | 2015-11-10 | Google Technology Holdings LLC | Channel quality indicator for time, frequency and spatial channel in terrestrial radio access network |
WO2007031691A1 (fr) * | 2005-09-14 | 2007-03-22 | France Telecom | Procede et dispositif de configuration d'un recepteur dans un dispositif de communication. |
US7894514B2 (en) * | 2005-09-29 | 2011-02-22 | Alcatel-Lucent Usa Inc. | Receiver techniques for wireless communication |
PL3337113T3 (pl) | 2005-09-30 | 2020-11-16 | Optis Wireless Technology, Llc | Urządzenie do transmisji radiowej oraz sposób transmisji radiowej |
WO2007072348A2 (en) * | 2005-12-20 | 2007-06-28 | Koninklijke Philips Electronics N.V. | A method for signal reception in a ofdm system |
US8238856B2 (en) | 2006-03-14 | 2012-08-07 | Nec Corporation | Wireless communicating apparatus, receiving method selecting method, and receiving method selecting program |
US7899134B2 (en) * | 2006-09-26 | 2011-03-01 | Qualcomm, Incorporated | Dynamic demodulator selection based on channel quality |
JP2010516095A (ja) * | 2007-01-05 | 2010-05-13 | インターデイジタル テクノロジー コーポレーション | ランダムアクセスチャネルにおけるバックオフ機構 |
US8521113B2 (en) * | 2007-04-30 | 2013-08-27 | Qualcomm Incorporated | Methods and apparatus for predicting a channel quality indicator in a communication system |
KR101360350B1 (ko) | 2007-08-21 | 2014-02-10 | 재단법인서울대학교산학협력재단 | 도플러 주파수를 이용한 링크 적응화 시스템 및 그 방법 |
US8577304B2 (en) * | 2007-10-31 | 2013-11-05 | Icera, Inc. | Synchronous CDMA communication system |
ATE536012T1 (de) * | 2008-01-22 | 2011-12-15 | Ericsson Telefon Ab L M | Verfahren, computerprogrammempfänger und vorrichtung zur bestimmung eines kanalqualitätsindex |
JP2010177954A (ja) * | 2009-01-28 | 2010-08-12 | Toshiba Corp | 受信回路 |
TW201101712A (en) * | 2009-04-23 | 2011-01-01 | Maxlinear Inc | Channel-sensitive power control |
JPWO2010128612A1 (ja) | 2009-05-07 | 2012-11-01 | Necカシオモバイルコミュニケーションズ株式会社 | 通信端末、その制御方法、およびプログラム |
US8843181B2 (en) * | 2009-05-27 | 2014-09-23 | Qualcomm Incorporated | Sensor uses in communication systems |
US20120327976A1 (en) * | 2011-06-21 | 2012-12-27 | Sairamesh Nammi | Method and Apparatus for Implementing Hybrid Rake/Equalizer Receiver for Spread Spectrum Systems |
US9294937B2 (en) | 2011-10-05 | 2016-03-22 | Qualcomm Incorporated | Apparatus and method for selection between receivers in a wireless communication system |
US9380519B2 (en) | 2013-03-13 | 2016-06-28 | Qualcomm Incorporated | Using motion to improve local wireless network connectivity |
US9380520B2 (en) | 2013-03-13 | 2016-06-28 | Qualcomm Incorporated | Using motion to improve local wireless network connectivity |
US9804664B2 (en) * | 2014-05-27 | 2017-10-31 | Qualcomm Incorporated | Adaptive control of RF low power modes in a multi-rate wireless system using MCS value |
CN105722094B (zh) | 2014-12-03 | 2019-12-06 | 索尼公司 | 在小小区之间进行干扰协同的方法以及无线通信设备 |
EP3329718A1 (en) * | 2015-07-30 | 2018-06-06 | Telefonaktiebolaget LM Ericsson (publ) | Methods of electronic communication device and network node, electronic communication device, network node, and computer programs |
CN106297250A (zh) * | 2016-10-10 | 2017-01-04 | 普天智能照明研究院有限公司 | 一种远距离家庭数据采集***和能耗采集*** |
US10772024B2 (en) * | 2018-01-12 | 2020-09-08 | At&T Intellectual Property I, L.P. | Adaptive multiple antenna transmission scheme for uplink data transmission in wireless communication systems |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05207076A (ja) * | 1991-11-25 | 1993-08-13 | Nec Corp | 受信機 |
JP2001196974A (ja) * | 2000-01-13 | 2001-07-19 | Ntt Docomo Inc | Cdma無線受信装置および制御方法 |
JP2002010363A (ja) * | 2000-06-26 | 2002-01-11 | Matsushita Electric Ind Co Ltd | 基地局装置、通信端末装置及び通信方法 |
JP2002026919A (ja) * | 2000-07-04 | 2002-01-25 | Matsushita Electric Ind Co Ltd | 高速パケット伝送システム |
JP2002208881A (ja) * | 2000-08-11 | 2002-07-26 | Mitsubishi Electric Inf Technol Center Europ Bv | 伝送路から受信されたシンボルを等化し、そこからデータを復号化する方法、データを符号化する方法、受信器、送信器並びに通信システム |
JP2003069459A (ja) * | 2001-08-24 | 2003-03-07 | Nippon Soken Inc | 受信機 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5483577A (en) * | 1994-01-24 | 1996-01-09 | Advanced Micro Devices, Inc. | Single chip telephone answering machine, telephone, speakerphone, and ADSI controller |
JP3681230B2 (ja) * | 1996-07-30 | 2005-08-10 | 松下電器産業株式会社 | スペクトル拡散通信装置 |
JPH1198066A (ja) * | 1997-09-19 | 1999-04-09 | Hitachi Denshi Ltd | 復調器及び復調方法 |
US6546045B1 (en) * | 1999-11-16 | 2003-04-08 | United States Of America | Method for communication using adaptive modem |
-
2003
- 2003-04-08 JP JP2003104428A patent/JP2004159284A/ja not_active Withdrawn
- 2003-07-14 AU AU2003248061A patent/AU2003248061A1/en not_active Abandoned
- 2003-07-14 WO PCT/JP2003/008881 patent/WO2004025876A1/ja not_active Application Discontinuation
- 2003-07-14 EP EP20030795200 patent/EP1473853A1/en not_active Withdrawn
- 2003-07-14 US US10/507,076 patent/US20050164644A1/en not_active Abandoned
- 2003-07-14 CN CNA03805731XA patent/CN1640021A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05207076A (ja) * | 1991-11-25 | 1993-08-13 | Nec Corp | 受信機 |
JP2001196974A (ja) * | 2000-01-13 | 2001-07-19 | Ntt Docomo Inc | Cdma無線受信装置および制御方法 |
JP2002010363A (ja) * | 2000-06-26 | 2002-01-11 | Matsushita Electric Ind Co Ltd | 基地局装置、通信端末装置及び通信方法 |
JP2002026919A (ja) * | 2000-07-04 | 2002-01-25 | Matsushita Electric Ind Co Ltd | 高速パケット伝送システム |
JP2002208881A (ja) * | 2000-08-11 | 2002-07-26 | Mitsubishi Electric Inf Technol Center Europ Bv | 伝送路から受信されたシンボルを等化し、そこからデータを復号化する方法、データを符号化する方法、受信器、送信器並びに通信システム |
JP2003069459A (ja) * | 2001-08-24 | 2003-03-07 | Nippon Soken Inc | 受信機 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7796680B2 (en) | 2004-02-12 | 2010-09-14 | Nec Corporation | Mobile communication system and wireless apparatus to be used for the same |
Also Published As
Publication number | Publication date |
---|---|
EP1473853A1 (en) | 2004-11-03 |
CN1640021A (zh) | 2005-07-13 |
AU2003248061A1 (en) | 2004-04-30 |
US20050164644A1 (en) | 2005-07-28 |
JP2004159284A (ja) | 2004-06-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2004025876A1 (ja) | 無線通信装置、受信装置、および受信方式選択方法 | |
JP4242606B2 (ja) | 通信制御システム、通信制御方法、移動局及び基地局 | |
JP3877713B2 (ja) | 移動通信システムにおける適応的伝送アンテナダイバーシティ装置及び方法 | |
JP4385054B2 (ja) | 無線通信チャネルの品質を推定し、報告する方法および装置 | |
EP0963074B1 (en) | Estimation of constellation size for adaptive modulation system | |
CA2263060C (en) | System and method for measuring channel quality information in a communication system | |
US7656960B2 (en) | Adaptive modulation method and coding rate control method | |
KR100549882B1 (ko) | 기지국 장치, 이동국 장치, 무선 통신 시스템 및 무선통신 방법 | |
CA2244428C (en) | System and method for measuring channel quality information | |
US7236474B2 (en) | Apparatus and method for reporting quality of downlink channel in W-CDMA communication systems supporting HSDPA | |
KR100525237B1 (ko) | 송신 장치, 기지국 장치, 통신 단말 장치, 패킷 송신 방법, 및 전송 시스템 | |
JP4575428B2 (ja) | 通信装置、送信装置及び通信方法 | |
US20050213505A1 (en) | Communication device and data retransmission control method | |
JP2005136773A (ja) | 無線伝送システム、送信側装置および受信側装置 | |
WO2002003573A1 (fr) | Unite de station de base et procede de radiocommunication | |
JP4626766B2 (ja) | 通信システム及び通信制御方法 | |
KR20080049686A (ko) | Hsdpa 채널 품질 지시자 선택에서 적응 잡음 내지신호 필터링을 위한 방법 및 장치 | |
WO2002009377A1 (en) | Communication terminal apparatus, base station apparatus, and communication method | |
US20070032199A1 (en) | Apparatus and method for receiving channel quality information in a mobile communication system | |
JP2004023145A (ja) | 移動通信システムおよび適応変調方法 | |
JP5195920B2 (ja) | 無線通信システムおよび無線装置 | |
CN101588592B (zh) | 时分双工***中上行信道质量估计方法及基站 | |
JP4270377B2 (ja) | 復調装置及び復調方法 | |
WO2004015891A1 (ja) | 無線装置及び基地局装置 | |
JP2005244685A (ja) | 無線機 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2003795200 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10507076 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2003805731X Country of ref document: CN |
|
WWP | Wipo information: published in national office |
Ref document number: 2003795200 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2003795200 Country of ref document: EP |